Aluminum-copper-magnesium alloys having ancillary additions...

Details Aluminum-copper-magnesium alloys having ancillary additions... Aluminum-copper-magnesium alloys having ancillary additions...

C - Chemistry, Metallurgy

22

C

C22C 21/16 (2006.01)

Patent

CA 2541322

An aluminum-copper-magnesium alloy having ancillary additions of lithium. The alloy composition includes from about 3 to about 5 weight percent Cu, from about 0.5 to about 2 weight percent Mg, and from about 0.01 to about 0.9 weight percent Li. The combined amount of Cu and Mg is maintained below a solubility limit of the aluminum alloy. The alloys possess improved combinations of fracture toughness and strength, and also exhibit good fatigue crack growth resistance.

L'invention concerne un alliage d'aluminium, de cuivre et de magnésium présentant des ajouts de lithium. La composition de l'alliage comprend de 3 % environ à 5 % environ en poids de Cuivre, de 0,5 % environ à 2 % environ en poids de magnésium et de 0,01 % environ à 0,9 % environ en poids de lithium. La quantité combinée de Cu et de Mg est maintenue en dessous d'une limite de solubilité et l'alliage d'aluminium. Les alliages décrits dans cette invention présentent des combinaisons améliorées de ténacité et de résistance, et ils présentent également une excellente résistance à la propagation des criques de fatigue.

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